package demo;

import java.util.Random;

/**
 * @author Huangjin
 * @version 1.0
 * describe:
 * @date 2023/2/20 18:37
 */
public class VerificationCode {
    public static void main(String[] args) {
        String code = generateVeriCode(4);
        System.out.println("验证码："+code);
    }
    public static String generateVeriCode(int len){
        String code = "";
        char[] chs = {'A','B','C','D','E','F',
                'G','H','I','J','K','L','M','N','O','P','Q','R',
                'S','T','U','V','W','X','Y','Z','a','b','c','d','e','f','g','h',
                'i','j','k','l','m','n','o','p','q','r','s','t',
                'u','v','w','x','y','z','0','1','2','3',
                '4','5','6','7','8','9'};
        for (int i = 0; i <= len; i++) {
            Random random = new Random();
            int index = random.nextInt(chs.length);
            code += chs[index];
        }
        return code;
    }
}
